Enantioselective Ester Hydrolysis Catalyzed by Imprinted Polymers. 2<sup>,</sup>
作者:Börje Sellergren、Rohini N. Karmalkar、Kenneth J. Shea
DOI:10.1021/jo000014n
日期:2000.6.1
1.9) and L-selectivity for the series B polymers (kL/kD = 1.2). The maximum rate enhancement, when compared with a control polymer, prepared using a benzoyl-substituted imidazole monomer as template, was 2.5, and comparing with the imidazole monomer in solution, a maximum rate enhancement of 10 was observed. The catalytic activity was higher for polymers subjected to the nucleophilic treatment. This
通过分子印迹制备的高度交联的网络聚合物对映体选择性催化N-叔丁氧羰基苯基丙氨酸-对硝基苯基酯(BOCPheONP)的水解。模板被设计为允许将蛋白水解酶糜蛋白酶中发现的关键催化元素掺入聚合物活性位点。评估了三个模型系统。它们由苯丙氨酸(A,C系列)或L-苯丙氨酸(B系列)的手性膦酸酯类似物构成,该手性膦酸酯类似物通过不稳定的酯键与含咪唑的乙烯基单体连接。模板与甲基丙烯酸(MAA)和乙二醇二甲基丙烯酸酯(EDMA)的自由基共聚得到了高度交联的网络聚合物。模板可以通过水解从聚合物中释放出来,给出设想的催化活性位点,该位点包含对映选择性的结合位点,与过渡态类似的结构(A,C系列)和氢键距离处的羟基,咪唑和羧酸基团互补的位点。如预料的那样,与模板构型互补的BOCPheONP的对映体优先水解,对A系列聚合物具有D选择性(kD / kL = 1.9),对B系列聚合物具有L选择性(kL / kD = 1.